| Language | AMR 4750 | TWELP 2400 | MELPe 2400 |
|---|---|---|---|
| American | 3.351 | 3.330 | 3.077 |
| Arabic | 3.277 | 3.253 | 3.053 |
| British | 3.272 | 3.181 | 3.019 |
| Chinese | 3.267 | 3.307 | 2.970 |
| Danish | 3.311 | 3.275 | 3.022 |
| Dutch | 3.089 | 3.114 | 2.830 |
| Finnich | 3.166 | 3.049 | 2.791 |
| French | 3.277 | 3.325 | 3.106 |
| German | 3.321 | 3.183 | 2.998 |
| Greek | 3.206 | 3.275 | 3.004 |
| Hindi | 3.286 | 3.246 | 3.089 |
| Hungarian | 3.305 | 3.279 | 3.086 |
| Italian | 3.462 | 3.363 | 3.226 |
| Japanese | 3.369 | 3.407 | 3.188 |
| Norwegian | 3.267 | 3.286 | 3.032 |
| Polish | 3.263 | 3.267 | 3.029 |
| Portuguese | 3.377 | 3.350 | 3.146 |
| Russian | 3.186 | 3.165 | 2.952 |
| Spanish | 3.343 | 3.294 | 3.048 |
| Swedish | 3.391 | 3.269 | 3.147 |
| Average | 3.289 | 3.261 | 3.041 |
|
Superiority of the TWELP 2400 bps vocoder over MELPe 2400 bps is on average 0.220 PESQ and just -0.028 PESQ in comparison with AMR 4750 bps | |||
Highest speech quality in very noisy channel
| BER % | MELPe 2400 | TWELP 2400 Robust (HD) | TWELP 2400 Robust (SD) |
|---|---|---|---|
| 0 | 3.041 | 3.127 | 3.127 |
| 1 | 2.513 | 3.039 | 3.079 |
| 2 | 2.186 | 2.963 | 3.006 |
| 3 | 1.940 | 2.810 | 2.964 |
| 4 | 1.748 | 2.582 | 2.908 |
| 5 | 1.582 | 2.321 | 2.842 |
You can play and listen short samples of the source speech as well as the speech processed by both vocoders in AWGN channel with BER = 5% for any of 20 languages, using links in the table below.
Our TWELP vocoders are used in the best transceivers from world leaders
Newest TWELP 700 bps vocoder is free of export restrictions and provides very high speech quality
| Language | TWELP 700 bps | TWELP 600 bps | MELPe 600 bps |
|---|---|---|---|
| American | 2.724 | 2.624 | 2.397 |
| Arabic | 2.603 | 2.479 | 2.254 |
| British | 2.678 | 2.577 | 2.414 |
| Chinese | 2.643 | 2.474 | 2.189 |
| Danish | 2.638 | 2.497 | 2.227 |
| Dutch | 2.475 | 2.366 | 2.173 |
| Finnich | 2.472 | 2.376 | 2.249 |
| French | 2.693 | 2.524 | 2.34 |
| German | 2.667 | 2.526 | 2.287 |
| Greek | 2.595 | 2.472 | 2.212 |
| Hindi | 2.660 | 2.563 | 2.403 |
| Hungarian | 2.659 | 2.546 | 2.359 |
| Italian | 2.837 | 2.720 | 2.428 |
| Japanese | 2.792 | 2.682 | 2.436 |
| Norwegian | 2.640 | 2.461 | 2.225 |
| Polish | 2.664 | 2.519 | 2.294 |
| Portuguese | 2.712 | 2.589 | 2.393 |
| Russian | 2.591 | 2.448 | 2.156 |
| Spanish | 2.648 | 2.537 | 2.389 |
| Swedish | 2.725 | 2.576 | 2.430 |
| Average | 2.6558 | 2.5278 | 2.3128 |
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Superiority of the TWELP 700 is on average 0.13(!) and 0.34 (!!!) PESQ appropriately | |||